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Old 2009-02-06, 16:01   #1
axn
 
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Jun 2003

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Default New proggy and timings

So I've been working on yet another Mersenne factorer using an all-integer assembly-coded Montgomery mulmod implementation.

For practical reasons it only supports factors > 2^64 < 2^94.

Anyway, I've been doing some comparison timings, and here are the results. If Prime95 does a work load in 1 unit of time, then my program takes 4.8 units while MFactor (32 bit) and factor5 (1 thread) takes 11.5 time units!!!

Are my results off or are Mfactor and factor5 _that_ much slower than Prime95?

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Old 2009-02-06, 16:14   #2
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"Luigi"
Aug 2002
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Quote:
Originally Posted by axn View Post
So I've been working on yet another Mersenne factorer using an all-integer assembly-coded Montgomery mulmod implementation.

For practical reasons it only supports factors > 2^64 < 2^94.

Anyway, I've been doing some comparison timings, and here are the results. If Prime95 does a work load in 1 unit of time, then my program takes 4.8 units while MFactor (32 bit) and factor5 (1 thread) takes 11.5 time units!!!

Are my results off or are Mfactor and factor5 _that_ much slower than Prime95?

Comments?
Factor5 is slower than Prime95. How slower partly depends on the exponent length: the only optimizations are those provided by GMP library, the rest is just plain C. I made no use of 64 bit integers in my code for readability and portability reasons.

Luigi
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